H7N9 bird flu reportedly spreads to Chinese city of Hangzhou, two new deaths

China’s avian flu outbreak continued to spread on Wednesday, with two more men reported dead in the city of Hangzhou. The nonprofit Flu Trackers website was the first to highlight a report by the Mandarin-language China News website, which cited a notification from the Zhejiang Provincial Health Department.

Those cases would bring the total to nine victims, four of whom have died. Cases have been identified in Shanghai, Anhui, Nanjing, Suqian, Suzhou, Wuxi, and now Hangzhou—a far-flung array of cities that are in some cases separated by hundreds of kilometers. Here’s everything you need to know about the outbreak.